Chuck for phonograph-styli



M. M. GRUBER.

CHUCK FOR PHONOGRAPH STYLI.

APPLICATION FILED MAIL29, I918; -RENEWED OCT- I 192l- 1,400,158. Patented Dec. 13,1921.

p19 30 30 INVENTORL 4 7n. %rw'6-u ATTORNEY- 7 there may be occasion for UNITED STATES FR-ERES PHONOGRAPH DELAWARE.

CHUCK FOR PHONOGRAPH-STYLI.

Specification of Letterslatent.

Patented Dec. 13, 1921.

Application filed March 29, 1918, Serial No. 225,430. Renewed October 1, 1921. Serial No. 504,674.

To all whom it may concern Be it known that I, Mourns M. GRUBER, a citizen of the United States, and a resident of New York, borough of Bronx, county of Bronx, and State of New York, have in vented certain new and useful Improve ments in Chucks for Phonograph-Styli, of which the following is a specification.

The present invention relates to a chuck for holding a phonograph stylus, and one of the objects of the invention is the provision of a chuck adapted for firmly holding styli ofa variety of different forms.

For the reproduction of phonograph records having laterally undulating sound grooves, sharp pointed needles are used, and these may be of various forms, such as the ordinary round shank, sharp'pointed steel needle, triangular wood or fiber needles, and so forth, and for the reproduction of phonograph records having sound grooves of the vertical undulating type, tracking members having a substantially round or spherical ball of sapphire, diamond and the like material are made use of, and where a phonograph is adapted to play both of these types of records it is desirable to make provision for equipping the reproducer with needles or styli suited to the particular type of rec-v ord and to obtain the particular effect desired to be produced, as of obtaining the full tone or half tone or other modified effects.

The chuck of the present invention is designed for securing the stylus to the reproducer so that the same is firmly held in place and yet can be readily removed and re-inserted or others substituted therefor, as such replacement or change. The term stylus is used herein to cover a phonograph record groove tracking member of any sort.

In the accompanying drawing I have shown one embodiment of my invention for the purpose of making the invention clearly understood andnot for the purpose of limitation.

In said drawing, Figure 1 is a front view of a stylus lever provided with a chuck having a triangular wooden needle in place therein and showing the outline of a phonograph reproducer in dotted lines. Fig. 2 is a side View of the lever shown in Fig. 1 shown separately from the reproducer and with the chuck sleeve detached. Fig. 3 is a longitudinal sectional view of the chuck,

having a round cylindrical shank,

taken on line 3, 3, Fig. 2. Fig. 4 is a cross sectional view taken on line 4, 4, Fig. 3. Fig. 5 is a cross-sectional view on line 5, 5, Fig. 3. Fig. 6 is a view similar to Fig. 3, but showing a triangular wooden needle held in place in the chuck. Fig. 7 is a view similar to Fig. 6, but showing the chuck having a stylus in place therein with a cylindrical shank and rounded point or ball. Fig. 8 is a side view of the ordinary sharp steel needle and Figs. 9 and 10 are, respectively, a longitudinal central view and an end view of'a modified form.

The chuck of the present invention may be used with any reproducer and with stylus levers of various constructions. In the form shown the stylus lever 10 is provided with a bearing member 11 which is pivotally supported between pivot screws 12, 12, and the arm 13 of the stylus lever has formed thereon or secured thereto the chuck which forms the subject-matter of the present invention. Said chuck comprises an internally screwthreaded chuck sleeve 14 and a chuck or holding member 15 on which the sleeve 14 is screwed. The holding member 15 has a preferably central cylindrical bore 16 which extends into the member 15 a suitable distance to accommodate the cylindrical shank 17 of a stylus 18 having a rounded tracking point of ball form as shown at 19, or a needle of the ordinary steel type as illustrated at 20, Fig. 8. Said bore 16 is enlarged toward its outer end as shown at 21, the said enlarg ment being preferably of triangular form in crosssection as clearly shown in Fig. 4. The bore may be made of the form described by first drilling the bore 16 in the chuck member 15 and then broaching out the portion 21 thereof to form a triangular recess or socket having preferably about half the depth of the bore 16. The chuck member 15 is substantially. strong and solid and is not compressible bodily, nary slotted chuck, and the means for holding the stylus within the chuck is movable in a slot or opening provided therefor, preferably at one side of the chuck. In the form shown the chuck member 15 has an open lateral slot 22 extending to the bore therein, and there is pivoted within the slot 22 the locking arm or lever 23 which, in the form shown. is pivotally mounted upon a wie 24 extending around the chuck member 15 and as in the case of the ordicrossing the slot 22 as shown in Fig. 4, and the free end 25 of the locking lever 23 is directed toward the mouth of the bore 16. The free end 25 of the locking lever 23 is preferably rounded, as shown, with the insertion of the stylus, and when a stylus is in place in the chuck the lever 23 projectslaterally beyond the chuck member 15 into contact with the preferably conical bore portion of the locking sleeve 14, while the inner portion of the free end 25 thereof projects inwardly of the bore within the member 15. The end 25 of the locking lever 23 preferably extends into the enlarged or broached portion 21 of the socket 16, as clearly shown in Fig. 3, in order that it may contact with the needle or stylus held in this portion of the socket, as, for example, the triangular wooden needle 26 shown in Figs. 1 and 6 and indicated in dotted lines in Fig. 3. Styli having cylindrical shanks are also firmly held by the locking member 23 bearing against the side thereof as shown in Fig. 7 In the modified form of Figs. 9 and 10 the locking lever 23 is provided with a laterally projecting stud 23 for limiting the inward movement of the lever within the slot 22 in the chuck member 15. Such stud, while not interfering with the clamping of a stylus in place, does positively prevent the locking lever from entering so far into the slot 22 as to act as a stop and thereby prevent the insertion of a stylus into the chuck.

The operation of a chuck embodying the inventionv will be readily understood from the foregoing. The locking lever 23 pivots freely on its mounting so that it may readily move in or out. To insert a stylus in the chuck, the sleeve 14 is unscrewed somewhat, freeing the lever 23, and the stylus inserted. Where a triangular wooden needle is used it can be inserted into the chuck member 15 only to the bottom of the broached portion 21 of the socket therein, and upon screwing up the chuck sleeve 14, the locking member 23 is pushed firmly against the side of the needle and'holds it securely in place and without any of the harmful effects which arise from the use of set-screws and similar holding devices which are apt to have a cutting, breaking or penetrating action. When a stylus having a cylindrical shank is used, it may be inserted past the broached portion 21 into the cylindrical portion 16 thereof and is held, upon screwing up the chuck sleeve 14, 1n the same manner as before, and

so as not to interfere when the chuck sleeve is unscrewed, the stylus may readily be removed, there being no part which can bind or stick and prevent the ready removal of the stylus.

It will be observed that a chuck in accordance with the invention is very simple; may be easily constructed and is adapted for holding styli of various forms; that there is none of the tendency to stick or bind which sometimes is encountered in chucks of the split type, and there are no rotating or turning parts contacting with the shank of the stylus needle so that there is no tendency to cut or tear or fray the same the styli may be readily inserted and firmly held and readily removed without trouble or difliculty; and no resistance is encountered to the insertion of a stylus within the chuck.

I claim: 7

1. A chuck for holding phonograph styli for playing records having record grooves of difierent types, comprising a chuck member having an angular bore extending part way therein and a cylindrical bore of reduced cross section in continuation of the angular bore, whereby the chuck is adapted to receive styli of a plurality of types, a lever pivoted in a slot provided therefor in the side of the chuck member, and a chuck sleeve screwed on the chuck member and adapted, upon being'screwed on the chuck member, to force the lever against the side of a stylus inserted in either of the bores of the chuck member.

2. A chuck for holding phonograph styli for playing records having record grooves of different types, comprising a chuck member having an angular bore 6X tending part way therein and a cylindrical bore of reduced cross section in continuation of the angular bore, whereby the chuck is adapted to receive styli of a plurality of types, a lever pivoted in a slot provided therefor in the side of the chuck member, said lever rounded off at its free end and provided with a stop tolimit its inward movement, and a chuck sleeve screwed on the chuck member and adapted, upon being screwed on the chuck member, to force the lever against the side of a stylus inserted in either of the bores of the chuck member.

In testimony that I claim the foregoing, 1 hereto set my hand, this 8th day of February, 1918.

MORRIS M. GR-UBER. 

